India’s latest communication satellite GSAT-15 successfully launched

November 11, 2015

Bengaluru, Nov 11: India’s latest communication satellite GSAT-15 was successfully launched by Ariane-5 rocket in the early hours on Wednesday from the spaceport of Kourou in French Guiana.

GSATThe European launcher blasted off at 03:04am (IST) and hurled the GSAT-15, designed to deliver telecommunications services, as well as dedicated navigation-aid and emergency services, into space in a flawless flight.

The satellite was launched into a Geosynchronous Transfer Orbit (GTO) after its co-passenger Arabsat-6B (BADR-7) was injected into space.

“Arianespace successfully launched two satellites this evening (local time): Arabsat-6B (BADR-7) for the operator Arabsat, and GSAT-15 for Isro (Indian Space Research Organisation),” Arianespace said.

GSAT-15, weighing 3,164 kg at lift-off, is a high power satellite being inducted into the INSAT/GSAT system. It carries a total of 24 communication transponders in Ku-band as well as a GPS-Aided GEO Augmented Navigation (GAGAN) payload operating in L1 and L5 bands, Isro said adding that it is the third satellite to carry GAGAN payload after GSAT-8 and GSAT-10, which are already providing navigation services from orbit.

It also carries a Ku-band beacon as well to help in accurately pointing ground antennas towards the satellite.

GSAT-15 is the 19th payload launched by Arianespace for Isro.

Speaking at Kourou, Isro Satellite Centre (ISAC) director M Annadurai said, “GSAT-15 satellite signal has been acquired by Master Control Facility at Hassan (in Karnataka). The initialisation commands are in process and the satellite health is hail and healthy.”

He said the launch of GSAT-15 will enable ISRO to provide continuity of service to Indian users in Ku-band and the navigation payload GAGAN of GSAT-15 will provide in orbit backup to ensure safety of life navigation services in civil aviation sector as well as other location based services to various services in the Indian region.

Annadurai also said other two communication satellites GSAT-17 and GSAT-18 are getting ready for launch by Ariane vehicle in the next year.

“The realisation of both the satellites are in very advanced stage.”

The launch was telecast live by Doordarshan. GSAT-15 brings in Ku-band capacity to augment as well as provide replacement to indigenous operational satellite capacity, Isro said.

“The launch of GSAT-15 will be one more step towards further strengthening the satellite navigation infrastructure and sustaining the communication infrastructure in the country,” Isro chief AS Kiran Kumar said in a recorded video message.

Indian satellite’s co-passenger Arabsat-6B, lofted for Airbus Defence and Space and Thales Alenia Space as part of a turnkey contract with Saudi Arabia-based Arabsat, was also launched by Ariane 5 VA-227.

According to Arianespace, Arabsat-6B, to be renamed BADR-7 once in orbit will provide broadcast, broadband and telecommunications services over the Middle East, Africa and Central Asia.

Ariane 5 mission had a total payload lift performance of 9,810kg. This includes the two satellites’ mass at liftoff -5,798kg for Arabsat-6B and 3,164kg for GSAT-15 - along with launcher integration hardware and Ariane 5’s dual-passenger deployment system.

The GAGAN payload in GSAT-15 provides the Satellite Based Augmentation System, through which the accuracy of the positioning information obtained from the GPS satellites is improved by a network of ground based receivers and made available to the users in the country through geostationary satellites, Isro said.

In the next few days, the MCF at Hassan will perform the initial orbit raising manoeuvres using the Liquid Apogee Motor (LAM) of the satellite to take it to its intended space home.

With the designed in-orbit operational life of 12 years, GSAT-15 will be positioned at 93.5 degree east longitude and co-located with INSAT-3A and INSAT-4B satellites.

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Agencies
June 15,2020

New Delhi, Jun 15: Average temperature of India experienced a rise of 0.7 degree Celsius, along with decline in rainfall, significant increase in frequency of very severe cyclonic storms and droughts in over a decade due to human activities, the Ministry of Earth Sciences in its research report said.

The contentions were made in a report issued by the ministry on the impact of climate change. It will be published by Union Minister Harsh Vardhan on June 19.

According to the report, "Since the middle of the twentieth century, India witnessed rise in temperature; decrease in monsoon; rise in extreme temperature and rainfall, droughts, and sea levels; and increase intensity of severe cyclones.

The report, prepared by researchers of the Centre for Climate Change Research, a cell under The Ministry's Indian Institute of Tropical Meteorology, Pune, further stated that there is compelling scientific evidence that human activities have influenced these changes in regional climate.

India's average temperature has risen by around 0.7 degrees Celsius during 1901-2018, it said, adding that the rise is largely on account of GHG-induced warming and partially offset by forcing due to anthropogenic aerosols.

It states that the average temperature over India is projected to rise by 4.4 degrees Celsius, while the intensity of heat waves is likely to increase by 3-4 times by the end of the century.

In the 30-year period between 1986 and 2015, temperatures of the warmest day and the coldest night of the year have risen by about 0.63 degrees Celsius and 0.4 degree Celsius.

According to the report, by the end of the century, the temperatures of the warmest day and the coldest night are projected to rise by approximately 4.7 degrees Celsius and 5.5 degrees Celsius, respectively.

Alarmingly, sea surface temperature of the tropical Indian Ocean has also risen by one degrees Celsius on average during 1951-2015.

"The frequency of very severe cyclonic storms during the post-monsoon season has increased significantly (+1 event per decade) during the last two decades (2000-2018)," it added.

This came in the backdrop of Cyclone 'Amphan' and 'Nisarga' which made landfalls on May 20 and June 3 and killed several people, flattened villages, and destroyed farms.

"This is the first-ever climate change assessment report for India. This report will be very useful for policy makers, researchers, social scientists, economists, and students," said M. Rajeevan, secretary, the Ministry of Earth Sciences.

Besides this, the report also highlighted various other unnerving data on climate change in the country. Both the frequency and extent of droughts have increased significantly during 1951-2016.

The overall decrease of seasonal "summer monsoon rainfall" during the last 6-7 decades has led to an increased propensity for droughts over India.

"In particular, areas over central India, southwest coast, southern peninsula and north-eastern India have experienced more than 2 droughts per decade, on average, during this period. The area affected by drought has also increased by 1.3 per cent per decade over the same period."

The Hindu Kush Himalayas (HKH) also experienced a temperature rise of about 1.3 degree Celsius during 1951-2014.

Several areas of the Himalayas have experienced a declining trend in snowfall and also retreat of glaciers in recent decades. By the end of the twenty-first century, its annual mean surface temperature is projected to increase by about 5.2 degree Celsius.

The summer monsoon precipitation from June to September over India has also declined by around 6 per cent from 1951 to 2015, with notable decreases over the Indo-Gangetic Plains and the Western Ghats, the report further states.

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News Network
January 27,2020

New Delhi, Jan 27: Remember the story of two friends coming face-to-face with a bear in a forest? One of the two friends climbs the tree to save his life and the other, not knowing how to, lays on the ground, breathless, pretending to be dead.

Well, that lesson turned out to be useful for this man who pretended to be dead when a tiger had both his paws on the man's chest.

Yes, that is right. IFS officer Parveen Kaswan recently shared a video of a man lying under a tiger, with their faces extremely close to each other with the caption, "You want to see how does a narrow escape looks like in case of an encounter with a #tiger. #Tiger was cornered by the crowd. But fortunately, the end was fine for both man and tiger. Sent by a senior."

Another Twitter user shared the full 30-second video in the comments. He also said that the incident occured in Tumsar in Bhandara district, Maharashtra. The spine-chilling clip shows a tiger running freely in the fields trying to avoid people who have surrounded him and are trying to shoo him away.

In his quest to run away, the scared tiger grabs a human. When he sees that people are still approaching him and trying to scare him away, he gets up and runs away for his life. All this while, the man who was captured by the animal lays still on the ground and does not make an attempt to get free.

This is what stuck with Twitter and they are praising the man for his presence of mind.

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News Network
August 8,2020

The Kozhikode International Airport located at Karipur is not safe for the landing of flights in rainy season, according to an air-safety expert, who had warned the aviation ministry and the civil aviation regulator about this in 2011. 

The warning was particularly about the dangers of permitting passenger aircraft to land on runway 10 of the airport during rains and unfavourable wind conditions. 

Nine years later, on August 7, 2020, the warning became a reality when an Air India Express pilots landed in tailwind conditions and the aircraft overshot the tabletop runway to drop off the end and crash.

 “An aircraft landing on runway 10 in tailwind will experience poor braking action due to heavy rubber deposits … All such flights … are endangering the lives of all on board,’’ said Capt Mohan Ranganathan, in a letter sent on June 17, 2011 to then director general of civil aviation Bharat Bhushan and Nasim Zaidi, chairman of a civil aviation safety advisory committee, which was formed after the May 2010 Mangaluru air crash which killed 158 people.

“My warning issued after the Mangaluru crash was ignored. It is a table-top runway with a down slope. The buffer zone at the end of the runway is inadequate,” Capt Ranganathan said. Given the topography, he pointed out, the airport should have a buffer of 240m at the end of the runway, but it only has 90m (which the DGCA had approved). “Moreover, the space on either side of the runway is only 75m instead of the mandatory 100m,” he added.

Capt Ranganathan said there is no guideline for operations on a table-top runway when it is raining. “Runway 10 approach should not be permitted in view of the lack of runway end safety area (RESA) and the terrain beyond the end of the runway. RESA of 240m should be immediately introduced and runway length has to be reduced to make the operations safe,” his letter said.

If an aircraft is unable to stop within the runway, there is no RESA beyond the end. The ILS localiser antenna is housed on a concrete structure and the area beyond is a steep slope. “The Air India Express accident in Mangalore should have alerted AAI to make the runway conditions safe. We have brought up the issue of RESA during the initial Casac-sub group meetings. We had specifically mentioned that the declared distances for both runways have to be reduced in order to comply with ICAO Annex 14 requirement,” Capt Ranganathan said.

He said the condition of the runway strip was known to DGCA teams that have been conducting inspection and safety assessments. “Have they considered the danger involved? Did the DGCA or the airlines lay down any operational restrictions or special procedures?”

The letter also refers to Approach and Landing Accident Reduction (ALAR) training, which is supposed to be mandatory before every monsoon, but airlines don’t follow it, he said. “70% of accidents take place during approach and landing and that is why this training is essential,” he added.

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